Argument about the design of the eye goes back before Darwin. Darwin's answer was frequent small modifications. This has been amplified by Nilssen and Pelger. The argument is incomplete, but adequate to buttress the faith of a materialist.
1. Darwin, C. 1851. On the origin of species. or the preservation of favoured races in the struggle for life. First ed. New York: D. Appleton and Company. At
https://www.gutenberg.org/files/1228/1228-h/1228-h.htm or
http://darwin-online.org.uk/converted/pdf/1861_OriginNY_F382.pdf2. Rennie, J. 2002. 15 answers to creationist nonsense. Scientific American 287: 78–85. At
https://www.scientificamerican.com/article/15-answers-to-creationist/3.
https://en.wikipedia.org/wiki/Evolution_of_the_eye4. Nilsson, D-E and S. Pelger. 1994. A pessimistic estimate of the time required for an eye to evolve. Proceedings of the Royal Society B: Biological Sciences 256: 53–58. At
http://rspb.royalsocietypublishing.org/content/256/1345/53 or
http://sci-hub.tw/http://rspb.royalsocietypublishing.org/content/256/1345/535. Dawkins, R. 1987. The Blind Watchmaker. New York: W. W. Norton & Company. At
http://dbanach.com/dawkins1.htm or
https://terebess.hu/keletkultinfo/The_Blind_Watchmaker.pdf6. Simpson, G. G. 1947. The problem of plan and purpose in Nature. The Scientific Monthly, 64(6): 481. At
https://www.jstor.org/stable/19203 or
https://sci-hub.tw/https://www.jstor.org/stable/192037. Zhao, F. et al. 2013. Complexity and diversity of eyes in early Cambrian ecosystems. Sci Rep 3: 2751. At
https://www.nature.com/articles/srep027518. Shu, D. G. et al. 1999. Lower Cambrian vertebrates from South China. Nature 402: 42–46. At
https://www.researchgate.net/profile/Min_Zhu4/publication/225090001_A_Lower_Cambrian_vertebrates_from_South_China/links/0fcfd510715179f374000000/A-Lower-Cambrian-vertebrates-from-South-China.pdf9. Smith, M. R. and J. B. Caron. 2010. Primitive soft-bodied cephalopods from the Cambrian. Nature 465: 427–428. At
https://www.nature.com/articles/nature09068 or
https://sci-hub.tw/https://www.nature.com/articles/nature09068 (Accepted draft at
https://tspace.library.utoronto.ca/bitstream/1807/32368/1/Nectocaris.pdf)
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